Engine Control Module (ECM) Invalid Data
The ECM is receiving data it can't validate.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine's computer is getting information from a sensor that's out of whack, making it think there's a problem when there might not be one.
What the computer is actually seeing
The ECM checks the validity of incoming data from sensors against programmed parameters. When it detects values outside these limits, it throws this code.
What a healthy reading looks like
The expected value range for valid signals is typically between 0.5V to 4.5V for analog sensors; make sure temperatures fall within normal operating ranges (180°F - 220°F for engine temps).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors for the sensor related to this SPN code. Make sure there's no corrosion, breaks, or loose connections.
- 22. Measure the signal voltage from the sensor. It should be within the expected range (0.5V - 4.5V). If not, the sensor may be faulty.
- 33. Inspect the sensor to see if it’s damaged. Replace it if you see any physical deformities or evidence of wear.
- 44. Examine the ground connections for the ECM and sensor. A poor ground can lead to invalid data.
- 55. If all wiring and connections check out, consider reprogramming or updating the ECM software to the latest version.
Common causes
- Faulty sensor
- Wiring issue (short/open circuit)
- Poor connection at the harness or ground point
- ECM software fault
- Data corruption from other modules
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but you should fix it soon to avoid performance issues.
Will the check engine light go off by itself?
Not likely; it will remain until the underlying issue is solved.
Why do I see this code with other SPN codes?
Multiple codes can appear if the root issue affects various readings or sensors.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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